以下属于毛细血管球结构的是（ ）
A．肾小体
B．肾小管
C．肾小球
D．肾小囊
答案：C
It seems to some experts that there are only three commonly-used video websites in this area: 56.com,
Youku.com, Tudou.com and they ____ 90% of the market. [ ]
A. make up
B. put up
C. set up
D. take up
秦并六国后全国的秘书机构也随之（）
A.鼎盛
B.完备
C.统一化
D.多样化
